Show simple item record

dc.contributor.authorHeres, Ana-Maria
dc.contributor.authorVoltas Velasco, Jordi
dc.contributor.authorClaramunt López, Bernat
dc.contributor.authorMartínez-Vilalta, Jordi
dc.date.accessioned2018-07-23T11:10:05Z
dc.date.available2018-07-23T11:10:05Z
dc.date.issued2014
dc.identifier.issn1445-4408
dc.identifier.urihttp://hdl.handle.net/10459.1/64622
dc.description.abstractWidespread drought-induced tree mortality has been documented around the world, and could increase in frequency and intensity under warmer and drier conditions. Ecophysiological differences between dying and surviving trees might underlie predispositions to mortality, but are poorly documented. Here we report a study of Scots pines (Pinus sylvestris L.) from two sites located in north-eastern Iberian Peninsula where drought-assocated mortality episodes were registered during the last few decades. Time trends of discrimination against 13C (D13C) and intrinsic water-use efficiency (WUEi) in tree rings at an annual resolution and for a 34 year period were used to compare co-occurring now-dead and surviving pines. Results indicate that both surviving and now-dead pines significantly increased their WUEi over time, although this increase was significantly lower for now-dead individuals. These differential WUEi trends corresponded to different scenarios describing how plant gas exchange responds to increasing atmospheric CO2 (Ca): the estimated intercellular CO2 concentration was nearly constant in surviving pines but tended to increase proportionally to Ca in now-dead trees. Concurrently, the WUEi increase was not paralleled by a growth enhancement, regardless of tree state, suggesting that in water-limited areas like the Mediterranean, it cannot overcome the impact of an increasingly warmer and drier climate on tree growth.
dc.description.sponsorshipThe authors would like to thank JP Ferrio, M Aguilera, P Sopeña and M Lucà for laboratory assistance and interesting discussions related to the study. We are indebted to M Mencuccini for field work and valuable discussion on the research topic. The authors also thank M Ninyerola and the Catalan Meteorological Service (SMC) for providing the two climatic datasets used in this study. Two anonymous referees contributed to the improvement of the original version of the article. This research was funded by the Spanish Ministry of Science and Innovation via competitive projects (CGL2007-60120, CSD2008-0040, CGL2010-16373) , a FPU PhD scholarship and a short study stay at the University of Lleida, Department of Crop and Forest Sciences
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherCSIRO Publishing
dc.relationMIECI/PN2004-2007/CGL2007-60120
dc.relationMICINN/PN2008-2011/CGL2010-16373
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1071/FP13067
dc.relation.ispartofFunctional Plant Biology, 2014, vol. 41, p. 244-256
dc.rights(c) CSIRO, 2014
dc.subjectDie-off
dc.subjectTree rings
dc.subjectWater stress
dc.subjectWestern Mediterranean
dc.titleDrought-induced mortality selectively affects Scots pine trees that show limited intrinsic water-use efficiency responsiveness to raising atmospheric CO2
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2018-07-23T11:10:07Z
dc.identifier.idgrec021594
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1071/FP13067


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record